// Copyright(c) 2019 - 2020, #Momo
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met :
// 
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
// 
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and /or other materials provided with the distribution.
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// 3. Neither the name of the copyright holder nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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#pragma once

#include "Utilities/Array/ArrayView.h"

namespace MxEngine
{
    class VertexBuffer;
    class IndexBuffer;
    struct VertexAttribute;

    enum class VertexAttributeInputRate
    {
        PER_VERTEX,
        PER_INSTANCE,
    };

    class VertexArray
    {
        using BindableId = unsigned int;

        BindableId id = 0;
        int attributeIndex = 0;
        void FreeVertexArray();
    public:
        VertexArray();
        ~VertexArray();
        VertexArray(const VertexArray&) = delete;
        VertexArray(VertexArray&& array) noexcept;
        VertexArray& operator=(const VertexArray&) = delete;
        VertexArray& operator=(VertexArray&& array) noexcept;

        BindableId GetNativeHandle() const;
        void Bind() const;
        void Unbind() const;
        void AddVertexLayout(const VertexBuffer& buffer, ArrayView<VertexAttribute> layout, VertexAttributeInputRate inputRate);
        void RemoveVertexLayout(ArrayView<VertexAttribute> layout);
        void LinkIndexBuffer(const IndexBuffer& buffer);
        int GetAttributeCount() const;
    };
}